﻿using System;
using System.Data;
using System.Data.SqlClient;

namespace SQLServerSyncServer
{
    class DBUtility : IDisposable
    {
        private string Server;
        private string Database;
        private string Uid;
        private string Password;
        private string connectionStr;
        private SqlConnection mySqlConn;

        public void EnsureConnectionIsOpen()
        {
            if (mySqlConn == null)
            {
                mySqlConn = new SqlConnection(this.connectionStr);
                mySqlConn.Open();
            }
            else if (mySqlConn.State == ConnectionState.Closed)
            {
                mySqlConn.Open();
            }
        }

        public DBUtility(string server, string database, string uid, string password)
        {
            this.Server = server;
            this.Database = database;
            this.Uid = uid;
            this.Password = password;
            this.connectionStr = "Server=" + this.Server + ";Database=" + this.Database + ";User Id=" + this.Uid + ";Password=" + this.Password;
        }

        public int ExecuteNonQueryForMultipleScripts(string sqlStr)
        {
            this.EnsureConnectionIsOpen();
            SqlCommand cmd = mySqlConn.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = sqlStr;
            return cmd.ExecuteNonQuery();
        }
        public int ExecuteNonQuery(string sqlStr)
        {
            this.EnsureConnectionIsOpen();
            SqlCommand cmd = new SqlCommand(sqlStr, mySqlConn);
            cmd.CommandType = CommandType.Text;
            return cmd.ExecuteNonQuery();
        }


        public object ExecuteScalar(string sqlStr)
        {
            this.EnsureConnectionIsOpen();
            SqlCommand cmd = new SqlCommand(sqlStr, mySqlConn);
            cmd.CommandType = CommandType.Text;
            return cmd.ExecuteScalar();
        }

        public DataSet ExecuteDS(string sqlStr)
        {
            DataSet ds = new DataSet();
            this.EnsureConnectionIsOpen();
            SqlDataAdapter sda = new SqlDataAdapter(sqlStr, mySqlConn);
            sda.Fill(ds);
            return ds;
        }


        public void Dispose()
        {
            if (mySqlConn != null)
                mySqlConn.Close();
        }
    }
}
